Source: petMD
They will naturally rest against the sides of the head, while pinned-back ears often signal a stressed dog.
A content dog will have relaxed, gentle eyes with frequent blinking.
A joyful dog’s entire body will appear relaxed, supple, and often exhibit a playful wiggle, lacking any signs of tension while displaying relaxed muscles.
Content dogs frequently exhibit a smile with an open mouth, upturned corners, and possibly visible teeth, all without any aggressive connotation.
Even as dogs age and slow down, unusual quietness or reluctance to participate in play and walks could indicate potential discomfort.
Although not all dogs are overly voracious, a sudden decrease in appetite might signal illness or unhappiness.
Content and well dogs typically rest around 16 hours daily; reduced sleep might indicate stress.
A wiggling dog displaying these cues is likely experiencing great happiness.